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Artemis Investment Management has boosted the resources on its £343 million UK Smaller Companies fund with the appointment of a co-manager.

William Tamworth takes up the newly created role and will work alongside current portfolio manager Mark Niznik (pictured) who joined Artemis from Standard Life Investments (SLI) in 2007 to run the smaller companies fund after former manager John Dodd stepped back to concentrate on the Artemis Alpha (ATS ) investment trust.

Tamworth has worked on the Artemis UK Smaller Companies fund since joining the firm in April last year. He previously held equity research analyst roles with Liberum Capital and Citigroup, where he specialised in smaller and medium-sized companies in the support services sector.

Over one year to the end of February Artemis UK Smaller Companies ranks 13 out of 54 funds in its sector with an 8.3% total return, nearly double that of its rivals. Over five years it lies 26 out of 49 with 67.6% growth.

Niznik, who formerly worked at Invesco Perpetual before moving to SLI, last briefly held a Citywire A-rating for his performance in 2012. Between June 2005 and April 2007 he was consistently rated either a top AAA or AA for his performance on Standard Life Investments UK Opportunities , which is now run by Harry Nimmo, SLI's star smaller companies manager who is Citywire A-rated.